摘要
在二次谱方法提取直扩信号扩谱周期的基础上 ,提出一种增强直扩信号二次谱的方法。这种方法不利用先验条件 ,在直扩信号二次谱的基础上 ,通过二次谱的局部统计分析 ,克服时域平稳噪声的影响 ,增强信号扩谱周期的特征谱线。实践证明 。
An enhanced spectrum reprocessing method is presented to estimate the duration of the pseudo noise (PN) sequence of direct spread spectrum sequence (DS/SS) signal. The new method is based on the spectrum reprocessing method. The local statistic analysis is used to enhance the special line of the spectrum-reprocessing of DS/SS signal. The presented method can compress noise with time stationary distribution. Practically, the new method can estimate the duration of the PN sequence of DS/SS signal precisely under the condition of very low signal to noise ratio without prior knowledge.
